Spraying machine



July 29, 1924.

L. E. FROST SPRAYING MACHINE Filed July 30.

2 Sheets-Shae t 1 INVENTOR Les/1e E. Frail AORNEY L. E. FROST SPRAYINGMACHINE Jul 29, 1924. 1,502,823

Filed July 30 1920 2 Sheets-Sheet 2 WITNESSES: I lNyENTOR A J 63116 EFrost BY v ATTORNEY UNITED STATES PATENT OFFICE.

LESLIE E. FROST, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC & HANUF ACTURINGCOMPANY, A. CORPORATION OF PENNSYLVANIA...

. srnavme MACHINE.

Application filed July 80,

fication.

My invention relates to spraying machines and more particularly tomachines of the type that is adapted for spraying liquid shellac uponmica splittings.

- Heretofore, the rocess of making mica Wrappers has conslsted infeeding a sheet of tissue paper or other suitable paper along a table.The paper was givefi a coating of shellac by brushing by hand and alayer of mica splittings applied manually. This operation was repeateduntil there were several alternate layers of shellac and mica splittingsapplied to the paper. Tissue paper was t en laid over the last layer ofsplittings and the formed wrapper was rolled upon a drum located at theend of the table.

This method has proven to be slow and expensive as all of the steps wereperformed by hand.

One of the objects of my invention 1s to provide a machine of thecharacter described that will automatically apply a thin and uniformcoating of shellac to a strip of aper as the same is automatically fedun er a spraying mechanism.

Another object of my invention 1s to provide means for confining andcarrying away the vapor and fumes resulting from the spraying operation.

Another object is to provide a simple and eflicient mechanism wherebyone spraying nozzle ma be caused to spray the entire width of t e paper.

In the said drawings Fig. 1 is a view in side elevation of a machineembodying my invention. I

Fig. 2 is a plan view of the machine of ig. 3 is a transverse sectlon onan enlarged scale on line IIIIII of Fig. 1.

Fig. 4 is an 'enlar ed sideelevational view of one of the centraspraying stations, part of the side wall thereof being broken away so asto show the spraying mechanism.

' Fi 5 is a front elevation of the spraying. nozz e and supportlngcarriage.

1920. Serial No. 400,234.

Fig. 6 is a side elevation of Fig. 5.

Fig. 7 1s a plan view of the carriage and track showing the spraycontrol mechanism.

Referring to the drawings, a table 1 is preferably formed of slattedstructure and is adapted to support a strip of paper 2 which 1s'cogtlnuously fed along the same from a. roll mounted near the end ofthe table.

Spraying stations A, B and C are arranged at spaced intervals along thetable, each of whlch comprises a frame 3 which serves, also as thesupports for the table 1. The portions of the frames above the table areprovided with side and end walls 4 and 5, respectively, which form ahood or housing enclosing the spraying mechanism -and which is providedwith doors 4' through which access may be had to the spraying mechanism.The sides of the hood terminate at a oint adjacent to the moving aper,allowmg suflicient clearance to permlt the strip to pass freelythereunder.

A tracr consisting of parallel and transversely extending rails 6 and 7secured to the ends walls 5 of the hood support a laterallyreciprocating carriage 8 at a suitable distance above the paper. Thecarriage is formed with ears 9 to which are secured the ends of cablesor wire ropes 10 which extend in opposite directions therefrom and whichpass over pulleys or sheaves 11 that are mounted on brackets 12 fixed tothe end walls of the hood and thence extend downwardly around pulleys 13carried by brackets 14 mounted on across bar 15 secured to the frame 3,from which point they extend inwardly and are secured at their ends toupwardly extending ears or projections 16 of the carriage 17. Thecarriage 17 is slidably mounted for transverse movement upon a trackcomprising parallel rails 18 supported at each end in brackets 19secured to horizontally disposed angle bars 20, which form a part of theframe? A double-acting screw-threaded shaft 21 is mounted in thebrackets 19 and at a point between and slightly below the track rails 18and is adapted to be engaged by a two-way screw-threaded portion 22depending from the carria e 17. A spur gear 23 is keyed to one end ofthe shaft 21 and is driven by means of a pinion 24 fixed to a shaft 25.One end of the shaft 25 is su ported in the bracket 19 and the other enthereof is mounted in a bracket 26 supported by horizontally disposedchannel bars 27 which is, in turn, supported by the angle bars 20 of theframe. he inner extremity of the shaft 25 has a bevelled pinion 28 fixedthereto which meshes with, and is driven by, a similar pinion 29keyed--to a horizontally extending drive shaft 30.

The carriages of the spraying stations A and C are actuated by means ofcables 31 which are also attached to the sliding carria e 17 and whichpass around pulleys 32 and 33 mounted in the brackets 14 and 12respectively, fromwhence they extend in opposite directions and aresecured at their other ends to similar spraying carriages at theirrespective stations.

The carriages 8 preferably comprise a rectangular frame provided with alongitudinal opening 34 within which aremounted flanged rollers 35adapted to ride upon the rail 7. The upper portion of the carriage frameis further provided with a bracket 36 which is slidably mounted thereinfor horizontal movement and carries a roller 37 adapted to be yieldablymaintained in rolling contact with the side of the rail 6 by means of acoil spring 38. The roller slide is formed with a pin or rod 39,normally in contact with one arm of abell crank lever 40, the other armof which is pivotally connected to a link 41 which actuates the valvestem of an atomizing or spraying nozzle 42 normally held closed by meansof a coil spring 43.

The rail 6 is formed with recesses or notches 44 at each end and in thepath of the roller 37. When the carriage reaches the end of its travelin both directions, the rollers 37 enter the recess 4 under the actionof the spring 38 and cause the pin 39 to release the bell crank lever 40which permits the valve of nozzle 42 to be closed by the action of thecoil spring 43 and temporarily shuts off the spray.

Air is supplied under pressure to the nozzle 42 by a pipe 45 leadingfrom a source of supply, not shown, the suction of which siphons liquidshellac through a pipe 46. The end of the pipe 46 is constantlysubmerged in a tank 47 of liquid shellac which extends the entire lengthof the travel of the carriage 8 across the table.

The hood enclosing the spraying mecha-' nism confines the suspendedparticles of shellac and the fumes thereof so that the former maygradually settle upon the moving aper and the latter may be drawn out oft e hood and carried away by means of horizontal flues 48- arrangedclose to the paper and adjacent to the openings under the sides 4 of thehood. The flues 48 are each provided along the bottom thereof withrelatively narrow slots 49 and the suction is regulated by means ofvalves or dampers 50. The flues 48 communicate with a common exhaustpipe 51 which extends beneath the table and which in turn communicateswith a suitable suction device or fan 52.

In operation, a sheet of fish paper is fed along the table and under thespraying station A. The power is applied from a suitable source, notshown, so as to cause the screw threaded shaft 21 to rotate. The slidingcarriage 17 is thus caused to move from side to side acros the tableand, through the medium of the cables 10,.cause the spraying carriage 8to move similarly across the table, but 1n an opposite direction. As thecarriage 8 reaches the end of its travel in one direction, the roller 37engages the notch 44 in the rail 6 and causes the spray to betemporarily cut oil. As a reverse movement of the carriage commences,.

the roller 37 is forced out of the notch, thereby causing the valve tobe opened, permitting the spray to be again directed upon the paper.

As the moving paper and its first coat of shellac emerges from theopposite side of the spraying station A, a layer of mica splittings isapplied thereto by hand. The strip continues in its travel and passesunder the spraying station B where a second coat of shellac is applied,this time to the layer of mica splittings. A third coat of shellac andlayer of mica splittings are applied in the same manner at station G andtissue paper is then applied to the top layer of splittings from aplurality of rolls 53. The entire wrapper is then rolled upon arelatively large drum 54 mounted at the end of the table.

I claim as my invention:

1. A spraying machine having, in combination, a movable spraying device,means for causing material to be sprayed to pass thereunder, and meansfor causing the spraying device to move laterally across said material.2. A spraying machine having, in combination, a movable carriage, aspraying device mounted on said carriage, a support adjacent saidcarriage, means for feeding material to be sprayed alon said support,and means for causing said carriage and spraying device to move acrossthe path of said material.

3. A spraying machine having, in combination, a table, means for feedinga strip of material along said table, a spraying device located abovethe table and over the path of the material and means for causing saidspraying device to move laterally across the path of said material.

4. A spraying machine having, in combination, a table, means for feedinga strip of material to the same, a spraying device located above saidtable and in the path of said material, means for: actuating saidspraying device to move the same laterally across the material, meansfor confining and means for carrying away the fumes of the spray. V

5. A spraying machine having, in combination, a support, means forfeeding a sheet of material along said support, a plurality of sprayingstations arranged along said support and over the path of said material,movable spraying devlces arranged at each station, adapted to direct aspray upon said material, and means for moving said spraying devicetransversely to the direction of movement of said material.

6. A spraying machine having, in combination, a table, means for feeding.a sheet of material along said table, a, plurality of independentspraying devices mounted on movable carriages at intervals along saidtable and over the path of said material, and means for causingtransverse movement ofsaid spraying devices to spray the entire width ofsaid material.

vIn testimony whereof, I have hereunto subscribed my name this 26th dayof July,

